In the house we are buying, a majourity of the walls are covered in a type of plywood or particle board. I am not sure what type it is, but it has a clear coat on it already (to keep the moisture off of it, I suppose). I want to paint the walls so they do not look so unfinished, but want it to look smooth. I was wondering if there are any primers or sealers that might work, and make it so it does NOT look like plywood underneath. The house is about 4,000sf with some rooms being 2 stories, so we probably would not want to have to spend the time sanding everything. Any ideas would be greatly appreciated. Thank you.